Investigation of interactions in a simulated geologic CO 2 /rock minerals system for CO 2 underground sequestration

H. Lin, T. Fujii, R. Takisawa, Toshiyuki Hashida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this study, laboratory supercritical fluid CO 2 -rock interactions experiments were conducted in a Hastelloy C-276 hydrothermal autoclave apparatus at 100 °C and a CO 2 pressure of 10 MPa. The dissolution characteristics of rock minerals and their surface texture alternation after CO 2 treatment were carefully examined by ICP-AES, GC/MASS and SEM/EDX investigation, respectively. The results showed that Si element was present in the treated scCO 2 fluid, and its concentration increased with the increasing reaction time. In addition, a high C content film deposit-like carbon was found to be present on the treated quartz surface. These suggested that a minute quantity of water in the form of porewater or vapor and reactive Hastelloy C in the autoclave should be mainly responsible for the dissolution of quartz into scCO 2 fluid and the formation of carbon deposit on the quartz surface. High catalysis of Hastelloy C also contributed to a significant reduction among CO 2 , H 2 O and rock minerals to produce some organics, such as some organic silicon compounds that could dissolve in the sCO 2 fluids. Consequently, a long-term investigation on the interactions between CO 2 and rock minerals should be requisite for evaluation of safety and feasibility of geologic CO 2 sequestration.

Original languageEnglish
Title of host publicationWATER DYANMICS
Subtitle of host publication4th International Workshop on Water Dynamics
Pages17-21
Number of pages5
DOIs
Publication statusPublished - 2007 May 11
Event4th International Workshop on Water Dynamics - Sendai, Japan
Duration: 2006 Nov 72006 Nov 8

Publication series

NameAIP Conference Proceedings
Volume898
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other4th International Workshop on Water Dynamics
CountryJapan
CitySendai
Period06/11/706/11/8

Keywords

  • C0 sequestration
  • Catalysis of hastelloy C
  • ScC0 -rock Interactions
  • Water or vapor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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